Often, files found in unsecured directories were uploaded without the creator's explicit long-term consent or due to data breaches.
You cannot index a JPG that isn't associated with a unique, text-rich URL.
Before we fix the problem, you must understand the enemy. Search engines are "blind." They do not see a stunning Alexander McQueen gown or a vintage Levi’s jacket. They see a string of code: image123.jpg .
You are losing 80% of your indexing potential by skipping Schema. Use (for resellers) or ImageObject Schema (for editorial).